When generating code with CubeMX (Version 6.14.1) for the STM32N657X0 with the following clock configuration for SAI1:
With the above MX configuration and below code, the SAI1 FS is around 2 KHz:
After adding the lines:
PeriphClkInitStruct.ICSelection[RCC_IC7].ClockSelection = RCC_ICCLKSOURCE_PLL3;
PeriphClkInitStruct.ICSelection[RCC_IC7].ClockDivider = 1;
to HAL_SAI_MspInit() in stm32n6xx_hal_msp.c the signals are correctly generated:
/* FILE: stm32n6xx_hal_msp.c */
void HAL_SAI_MspInit(SAI_HandleTypeDef* hsai)
{
GPIO_InitTypeDef GPIO_InitStruct;
DMA_NodeConfTypeDef NodeConfig;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/* SAI1 */
if(hsai->Instance==SAI1_Block_A)
{
/* Peripheral clock enable */
/** Initializes the peripherals clock
*/
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_SAI1;
PeriphClkInitStruct.Sai1ClockSelection = RCC_SAI1CLKSOURCE_IC7;
/* BELOW MISSING FROM GENERATED CODE */
PeriphClkInitStruct.ICSelection[RCC_IC7].ClockSelection = RCC_ICCLKSOURCE_PLL3; // MANUALLY ADDED
PeriphClkInitStruct.ICSelection[RCC_IC7].ClockDivider = 1; // MANUALLY ADDED
/* ABOVE MISSING FROM GENERATED CODE */
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
if (SAI1_client == 0)
{
__HAL_RCC_SAI1_CLK_ENABLE();
/* Peripheral interrupt init*/
HAL_NVIC_SetPriority(SAI1_A_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(SAI1_A_IRQn);
}
SAI1_client ++;
/*...*/
}
/* FILE: main.c */
/**
* @brief SAI1 Initialization Function
* @PAram None
* @retval None
*/
static void SAI1_Init_TDM(void)
{
/* USER CODE BEGIN SAI1_Init 0 */
/* USER CODE END SAI1_Init 0 */
/* USER CODE BEGIN SAI1_Init 1 */
/* USER CODE END SAI1_Init 1 */
hsai_BlockA1.Instance = SAI1_Block_A;
hsai_BlockA1.Init.Protocol = SAI_FREE_PROTOCOL;
hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_TX;
hsai_BlockA1.Init.DataSize = SAI_DATASIZE_16;
hsai_BlockA1.Init.FirstBit = SAI_FIRSTBIT_MSB;
hsai_BlockA1.Init.ClockStrobing = SAI_CLOCKSTROBING_FALLINGEDGE;
hsai_BlockA1.Init.Synchro = SAI_ASYNCHRONOUS;
hsai_BlockA1.Init.OutputDrive = SAI_OUTPUTDRIVE_ENABLE;
hsai_BlockA1.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
hsai_BlockA1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_1QF;
hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_16K;
hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
hsai_BlockA1.Init.MckOutput = SAI_MCK_OUTPUT_ENABLE;
hsai_BlockA1.Init.MonoStereoMode = SAI_MONOMODE;
hsai_BlockA1.Init.CompandingMode = SAI_NOCOMPANDING;
hsai_BlockA1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
hsai_BlockA1.Init.PdmInit.Activation = DISABLE;
hsai_BlockA1.FrameInit.FrameLength = 128;
hsai_BlockA1.FrameInit.ActiveFrameLength = 16;
hsai_BlockA1.FrameInit.FSDefinition = SAI_FS_CHANNEL_IDENTIFICATION;
hsai_BlockA1.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;
hsai_BlockA1.FrameInit.FSOffset = SAI_FS_BEFOREFIRSTBIT;
hsai_BlockA1.SlotInit.FirstBitOffset = 0;
hsai_BlockA1.SlotInit.SlotSize = SAI_SLOTSIZE_16B;
hsai_BlockA1.SlotInit.SlotNumber = 8;
hsai_BlockA1.SlotInit.SlotActive = SAI_SLOTACTIVE_0 | SAI_SLOTACTIVE_1 | SAI_SLOTACTIVE_2 | SAI_SLOTACTIVE_3 | SAI_SLOTACTIVE_4 | SAI_SLOTACTIVE_5 | SAI_SLOTACTIVE_6 | SAI_SLOTACTIVE_7;
if (HAL_SAI_Init(&hsai_BlockA1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SAI1_Init 2 */
/* USER CODE END SAI1_Init 2 */
}